201504

Appears in sequences

• Numbers k such that R_(k+2) + 5*10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=13A256931
• a(n) is the starting position of the second occurrence of a string of the initial n binary digits of Pi in the binary expansion of Pi.at n=15A385937
• a(n) is the starting position of the second occurrence of a string of the initial n binary digits of Pi in the binary expansion of Pi.at n=16A385937